The Plachutta is related to a number of other problem themes: it can be regarded as a Würzburg-Plachutta brought about by a white sacrifice on the critical square (a Würzburg-Plachutta itself being a pair of Holzhausen interferences); or it can be thought of as a Novotny with similarly moving (rather than differently moving) black pieces involved (a Novotny itself being a Grimshaw brought about by a white sacrifice on the critical square).
Essentially a pair of Holzhausen interferences (or a Wurzburg-Plachutta interference) brought about by a white sacrifice on the critical square.